Interactions of Collective Excitations with Vortices in Superfluid Systems

Details Interactions of Collective Excitations with Vortices in Superfluid Systems Interactions of Collective Excitations with Vortices in Superfluid Systems

1994-12-26

arxiv.org/abs/cond-mat/9412110v1

Physics

Condensed Matter

18 pages, Latex

Scientific paper

10.1103/PhysRevB.52.476

We investigate the interactions of collective excitations with vortices in superfluid systems, including $~^4$He and superconductors. The dynamical equations are obtained by the aid of the many-body wavefunction and the density-density correlation function. The scattering cross-section of collective excitations with a vortex is calculated in the Born approximation (valid at long wavelengths), and is expressed in terms of the collective excitation spectrum $ \omega (q) $ by the simple and general formula $ \sigma = \frac{\pi}{2} \frac{q}{[\omega'(q)]^2} \cot^2\frac{\theta}{2} $, where $ q $ is the wave number of the excitation, and $\theta $ is the scattering angle. At short wave lengths, the classical equations of motion are derived.

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